Aggregate Allocation of Purchase Price (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Transaction to Real Estate Investments [Line Items]
Total purchase price	$ 29,900	$ 190,743
Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price	30,748	176,443
TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		19,000
TENNESSEE | Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price		16,812
VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		17,743
VIRGINIA | Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price		18,440
OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	11,000
OHIO | Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price	11,848
FLORIDA
Transaction to Real Estate Investments [Line Items]
Total purchase price	18,900
FLORIDA | Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price	18,900
Land
Transaction to Real Estate Investments [Line Items]
Total purchase price	6,062	31,338
Land | TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		3,503
Land | VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		6,394
Land | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	2,282
Land | FLORIDA
Transaction to Real Estate Investments [Line Items]
Total purchase price	3,780
Building
Transaction to Real Estate Investments [Line Items]
Total purchase price	23,376	120,502
Building | TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		11,960
Building | VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		10,862
Building | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	8,256
Building | FLORIDA
Transaction to Real Estate Investments [Line Items]
Total purchase price	15,120
Site Improvements
Transaction to Real Estate Investments [Line Items]
Total purchase price	639	15,238
Site Improvements | TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		1,349
Site Improvements | VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		1,184
Site Improvements | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	639
Tenant Improvements [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price	671	9,365
Tenant Improvements [Member] | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	671
Leaseholds and Leasehold Improvements [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price	1,269	29,803
Leaseholds and Leasehold Improvements [Member] | TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		4,288
Leaseholds and Leasehold Improvements [Member] | VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		3,218
Leaseholds and Leasehold Improvements [Member] | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	1,269
Above Market Lease [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		5,458
Below Market Lease Liabilities [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price	2,117	20,961
Below Market Lease Liabilities [Member] | TENNESSEE
Transaction to Real Estate Investments [Line Items]
Total purchase price		2,100
Below Market Lease Liabilities [Member] | VIRGINIA
Transaction to Real Estate Investments [Line Items]
Total purchase price		3,915
Below Market Lease Liabilities [Member] | OHIO
Transaction to Real Estate Investments [Line Items]
Total purchase price	$ 2,117
Joint Venture Agreement [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		154,000
Joint Venture Agreement [Member] | Real Estate Investment
Transaction to Real Estate Investments [Line Items]
Total purchase price		141,191
Joint Venture Agreement [Member] | Land
Transaction to Real Estate Investments [Line Items]
Total purchase price		21,441
Joint Venture Agreement [Member] | Building
Transaction to Real Estate Investments [Line Items]
Total purchase price		97,680
Joint Venture Agreement [Member] | Site Improvements
Transaction to Real Estate Investments [Line Items]
Total purchase price		12,705
Joint Venture Agreement [Member] | Tenant Improvements [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		9,365
Joint Venture Agreement [Member] | Leaseholds and Leasehold Improvements [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		22,297
Joint Venture Agreement [Member] | Above Market Lease [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		5,458
Joint Venture Agreement [Member] | Below Market Lease Liabilities [Member]
Transaction to Real Estate Investments [Line Items]
Total purchase price		$ 14,946